JP7351693B2 - absorbent articles - Google Patents

Description

The present invention relates to absorbent articles such as sanitary napkins, panty liners, and incontinence pads, and more particularly to absorbent articles having a top sheet with a large number of convex portions that bulge toward the skin.

Conventionally, it has been used as a surface material for absorbent articles to provide appropriate embossed patterns for various purposes, such as suppressing the feeling of wetness by reducing the contact area with the skin, or creating texture and increasing tactility. There are products on the market that are formed into an uneven shape. In addition, surface materials with appropriate openings have been developed for various purposes, such as increasing the absorption rate of body fluids and eliminating sticky feeling by eliminating residual fluid on the surface. Examples of this type include the following Patent Documents 1 and 2.

Patent Document 1 below discloses that the top sheet has at least two layers including a first fiber layer made of cotton and thermoplastic resin fibers and a second fiber layer made of hydrophobic thermoplastic resin fibers. A nonwoven fabric comprising a fibrous layer, the nonwoven fabric having a first surface facing the skin and formed by the second fibrous layer, and a surface facing the non-skin facing side facing the absorbent body. The nonwoven fabric has a second surface ( An absorbent article is disclosed that includes a plurality of recesses that are recessed toward the non-skin facing surface.

Further, in Patent Document 2 below, an uneven nonwoven fabric is arranged on the skin-facing side of the absorbent body, and the uneven nonwoven fabric includes synthetic fibers or pulp containing a thermoplastic resin, and at least the skin-facing side has an uneven shape. The absorbent body has a laminated structure in which a plurality of absorbent sheets containing pulp are laminated, and the uneven nonwoven fabric and the absorbent body are cut in the thickness direction of the absorbent article. A plurality of slits are formed spaced apart in the planar direction of the absorbent article, the slits span two or more convex portions in the uneven nonwoven fabric, and in the absorbent body, An absorbent article is disclosed that spans multiple layers of absorbent sheets forming the laminated structure.

Patent No. 6001207 Patent No. 6518062

However, in absorbent articles in which apertures are formed in the top sheet, burrs are formed around the periphery of the apertures, with the fiber ends protruding toward the skin, due to piercing or pulling out of pins during the perforation process. Sometimes, the tip of the burr hits the wearer's skin, causing pain and itching, leading to a problem in the wearer's comfort.

Furthermore, in the above-mentioned Patent Document 1, paragraph [0071] etc. describe a form in which a hole is formed in the peripheral wall surface of the recess, and it is thought that body fluids flowing into the recess through the hole will easily transfer to the absorbent body side. However, since the hole is formed in the peripheral wall of the recess, body fluid tends to remain on the bottom of the recess, and the body fluid remaining on the side surface of the skin may cause stickiness.

Furthermore, in the absorbent article described in Patent Document 2, since the slit is formed on a convex portion that directly contacts the skin surface, fiber ends may protrude toward the skin side from the periphery of the slit during slit processing. There was a risk that the fiber ends protruding toward the skin would come into contact with the skin surface, reducing the wearing comfort.

Furthermore, body fluids that are absorbed into the absorbent body through the pores and slits tend to stay in the vicinity of the pores and slits, making it easy for the body fluids to flow back, and the accumulated body fluids to absorb subsequent body fluids. There was a problem in that the absorption of water was inhibited and the absorption capacity was reduced.

Therefore, the main object of the present invention is to provide an absorbent article that provides a good feeling when worn, prevents relapse, and suppresses a decrease in absorbent performance.

In order to solve the above problems, a first aspect includes an absorbent body, a liquid-permeable topsheet that covers the skin-contacting surface side of the absorbent body, and a liquid-permeable topsheet disposed between the absorbent body and the topsheet. Equipped with a liquid-permeable second sheet,
A large number of convex portions bulging toward the skin side are formed on the top sheet in a regular lattice shape or a diamond lattice shape when viewed from above ,
An opening that penetrates the top sheet and the second sheet in the thickness direction is formed in a region other than the convex portion, and an absorbent body penetration that communicates with the opening and penetrates the absorbent body in the thickness direction. or an absorbent body recessed part is formed by recessing the skin side surface of the absorbent body toward the non-skin side,
A compressed part that integrally compresses the top sheet, second sheet, and absorbent body is formed in a region other than the convex part that is a predetermined distance away from the opening part , and is located on the skin side of the top sheet and on the non-skin side of the absorber. It is provided with a recessed shape on both sides,
The planar shape of the compressed portion from the skin side of the top sheet is circular or oval, and the planar shape of the compressed portion from the non-skin side of the absorbent body is a lattice-like shape that extends continuously to an area other than the convex portion. An absorbent article characterized by having a compressed portion is provided.

In the first aspect, a large number of convex portions that bulge toward the skin side are formed on the top sheet in a regular lattice shape or a rhombic lattice shape in plan view , and the top sheet and the second An opening is formed that penetrates the sheet in the thickness direction. That is, the opening portion is formed in a relatively recessed portion other than the convex portion. Therefore, even if fiber ends (burrs) that protrude toward the skin are formed on the periphery of the hole during hole processing, the convex portion prevents the hole from coming into direct contact with the skin, reducing the feeling of wearing. It becomes possible to maintain a good wearing feeling without any discomfort.

In addition, since an absorber penetrating portion that communicates with the aperture and penetrates the absorber in the thickness direction or an absorber recess in which the skin side of the absorber is recessed toward the non-skin side is formed, the aperture Body fluids that have passed through the top sheet and the second sheet and transferred to the absorbent body are easily absorbed into the absorbent body.

Furthermore, in a region other than the convex portion that is a predetermined distance from the opening, a compressed portion that integrally compresses the top sheet, second sheet, and absorbent body is formed on the skin side of the top sheet and the absorbent core. Since both non-skin sides are recessed , body fluids that have migrated to the absorbent body through the openings are drawn into the compressed part by capillary action due to the difference in density of the fibers. Because it diffuses into the surroundings, body fluids do not stay in or near the openings, preventing body fluids from flowing back through the openings, and making it easier for body fluids to be continuously absorbed into the absorbent body through the openings. , the decline in absorption performance can be suppressed.

As a second aspect, an absorbent article is provided in which the bottom of the compressed portion is located within the thickness of the absorbent body.

In the second aspect, since the bottom of the compressed part is located within the thickness range of the absorbent body, the compressed part reliably compresses the absorbent body and ensures that a difference in fiber density is formed. become.

As a third aspect, there is provided an absorbent article in which the distance between the aperture and the compressed part is 1 to 5 mm.

In the third aspect, in order to ensure that the body fluid absorbed into the absorbent body through the apertures is drawn into the compressed part due to the difference in fiber density, the apertures and the compressed part are separated from each other. The distance is set to 1 to 5 mm.

As a fourth aspect, in plan view , the aperture is arranged in a central part surrounded by the four adjacent convex parts, and the aperture is arranged around the aperture and the adjacent convex parts An absorbent article is provided in which compressed portions from the skin side of the topsheet are arranged between the two.

In the fourth aspect, the aperture is arranged in a central part surrounded by the four adjacent protrusions in plan view, and the adjacent protrusions are located around the aperture. Since the compressed portions from the skin side of the top sheet are arranged between the two, convex portions are arranged around the openings to ensure that the openings do not come into direct contact with the skin, Body fluids that have entered the openings quickly diffuse to the surrounding compressed areas, suppressing backflow and deterioration of absorption performance.

As described in detail above, according to the present invention, it is possible to maintain a good wearing feeling, prevent relapse, and suppress a decrease in absorption performance.

1 is a partially cutaway developed view of a sanitary napkin 1 according to the present invention. FIG. 2 is an enlarged plan view of the surface of the sanitary napkin 1. FIG. 3 is a view taken along the line III-III in FIG. 2. FIG. 3 is a view taken along the line IV-IV in FIG. 2. FIG. FIG. 3 is a cross-sectional view (corresponding to the III-III line arrow view in FIG. 2) according to a modified example. FIG. 3 is an enlarged plan view of the surface of a sanitary napkin 1 according to a modified example. It is an enlarged perspective view of the main part. FIG. 3 is an enlarged plan view of the surface of a sanitary napkin 1 according to a modified example. FIG. 3 is a cross-sectional view showing a processing device 30. FIG.

Embodiments of the present invention will be described in detail below with reference to the drawings.

[Basic structure of sanitary napkin 1]
As shown in FIGS. 1 to 3, a sanitary napkin 1 according to the present invention includes a liquid-impermeable back sheet 2 made of a polyethylene sheet or the like placed on the non-skin side, and a liquid-impermeable back sheet 2 placed on the skin side. , a liquid-permeable surface sheet 3 through which menstrual blood, vaginal discharge, etc. (hereinafter also collectively referred to as body fluids) quickly permeate, and cotton-like pulp or synthetic pulp interposed between these two sheets 2 and 3. a second absorbent body 4 made of a hydrophilic non-woven fabric or the like, which is located between the topsheet 3 and the absorbent body 4 and is adjacent to the non-skin side of the topsheet 3 and has a shape substantially the same as the topsheet 3. A sheet 6, and side sheets 7, 7 provided on both sides of the skin contact surface side over almost the entire length in the longitudinal direction, and around the absorbent body 4, the upper and lower edges thereof The outer edges of the back sheet 2 and the top sheet 3 are joined by adhesive such as hot melt, heat sealing, ultrasonic sealing, or other bonding means, and the outer edges of the back sheet 2 and the top sheet 3 extend laterally beyond the absorber 4 at both side edges. The back sheet 2 and the side sheet 7 are joined by adhesive such as hot melt, heat sealing, ultrasonic sealing, etc. to form a flap portion in which the absorbent body 4 is not interposed. . Note that, in order to maintain the shape of the absorbent body 4 and improve its diffusivity, the absorbent body 4 may be surrounded by a covering sheet made of crepe paper, nonwoven fabric, or the like.

Hereinafter, the structure of the sanitary napkin 1 will be explained in more detail.
For the back sheet 2, a sheet material such as polyethylene that has at least water-blocking properties is used, but from the viewpoint of preventing stuffiness, it is desirable to use a sheet material that has moisture permeability. This water-blocking and moisture-permeable sheet material is made by melt-kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching the sheet in a uniaxial or biaxial direction. A sheet is preferably used. One or more adhesive layers (not shown) are formed on the non-skin side (outer surface) of the back sheet 2 along the longitudinal direction of the napkin, and fix the sanitary napkin 1 to underwear when worn on the body. It looks like this. As the back sheet 2, a polylaminated nonwoven fabric made by laminating a plastic film and a nonwoven fabric may be used.

Next, as the top sheet 3, a perforated or non-perforated nonwoven fabric is preferably used. The material fibers constituting the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupro, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is superior in that it has high flexibility and drapability, and the thermal bond method is superior in that it is bulky and has high compression recovery properties. When a large number of through holes are formed in the top sheet 3, body fluids are quickly absorbed, resulting in excellent dry touch properties. The fibers of the nonwoven fabric may be either long fibers or short fibers, but it is preferable to use short fibers to give the texture of toweling. Further, in order to facilitate embossing, it is preferable to use olefin fibers such as polyethylene or polypropylene having a relatively low melting point. Further, composite fibers such as core-sheath type fibers, side-by-side type fibers, and split type fibers, which have a core of fibers with a high melting point and a sheath of fibers with a low melting point, can also be suitably used.

The absorbent body 4 interposed between the back sheet 2 and the top sheet 3 is made of, for example, cotton-like pulp and a water-absorbing polymer. The water-absorbing polymer is mixed into the pulp constituting the absorbent body, for example, in the form of granular powder. Examples of the pulp include chemical pulps obtained from wood, cellulose fibers such as dissolving pulp, and those made of artificial cellulose fibers such as rayon and acetate. Softwood pulps with longer fiber lengths have better functionality and properties than hardwood pulps. It is suitable for use in terms of price. As for the manufacturing method of the absorbent body 4, it is preferable to use stacked pulp so that it is highly flexible, but it is also possible to use an air-laid absorbent body that can reduce the bulk. The absorbent body 4 may be surrounded by an enveloping sheet (not shown) made of crepe paper, nonwoven fabric, or the like in order to maintain its shape and improve its diffusibility.

Further, it is preferable that the absorbent body 4 contains fibers made of thermoplastic resin. The thermoplastic resin can be, for example, a polyolefin type such as polyethylene or polypropylene, a polyester type such as polyethylene terephthalate or polybutylene terephthalate, a polyamide type such as nylon, or a copolymer thereof. It may also be a mixture of. In particular, olefin resins such as polyethylene and polypropylene are suitable. Further, composite fibers such as core-sheath type fibers, side-by-side type fibers, split type fibers, etc., which have a core of fibers with a high melting point and a sheath of fibers with a low melting point, can also be used. In the case of hydrophobic fibers, it is desirable that the thermoplastic resin fibers be surface-treated with a hydrophilic agent so that they have an affinity for body fluids.

The hydrophilic second sheet 6 disposed between the top sheet 3 and the absorbent body 4 may be any material as long as it is hydrophilic to body fluids. Specifically, materials that have hydrophilic properties such as recycled fibers such as rayon and cupro, natural fibers such as cotton, or synthetic materials such as olefins such as polyethylene or polypropylene, polyesters, and polyamides are used. Fibers that have been surface-treated with a hydrophilic agent to impart hydrophilic properties can be used. As will be described later, this second sheet 6 is laminated on the back side (non-skin side) of the top sheet 3, and the absorbent body 4 is laminated on the back side of the second sheet 6. It is joined to the absorber 4 by heat fusion (emboss).

The second sheet 6 and the absorbent body 4 are desirably joined by not only heat fusion using the compressed portion 14 described below but also by intermittently applying a hot melt adhesive over the entirety. By adhering the second sheet 6 to the absorbent body 4 and bringing it into close contact with the absorbent body 4, bodily fluids absorbed by the second sheet 6 can easily transfer to the absorbent body 4 quickly.

In the illustrated example, the width dimension of the topsheet 3 is approximately equal to the width of the absorbent core 4, and it only covers the absorbent core 4, and the side sheet 7 outside the topsheet 3 is separate from the topsheet 3. Specifically, it is constructed using a non-woven fabric material that has been subjected to appropriate water-repellent treatment or hydrophilic treatment, depending on the purpose of preventing menstrual blood, vaginal discharge, etc. from penetrating, or increasing the texture. A side seat 7 is provided.

The side sheet 7 may be made of natural fibers, synthetic fibers, recycled fibers, or the like and formed by an appropriate processing method, but it is preferable that the side sheet 7 has a lower basis weight in order to improve its ability to hide body fluids. It is better to use a high-strength non-woven fabric. Specifically, it is desirable to use a nonwoven fabric with a basis weight of 13 to 23 g/ ^m2 , and to reliably prevent the permeation of body fluids, silicone-based, paraffin-based, alkylchromic chloride-based water repellents, etc. are used. A water-repellent nonwoven fabric coated with is preferably used.

The side sheet 7 is adhesively bonded with an adhesive such as hot melt from a predetermined inner position to the outer edge of the back sheet 2 from the middle part in the width direction, and the side sheet 7 and the back sheet 2 are Side flap portions in which the absorbent body 4 is not interposed are formed on both sides of the absorbent body 4 by the laminated sheet portions. On the other hand, in the illustrated example, the inner side portion of the side sheet 7 is laminated on the skin side of the top sheet 3 and adhered to the absorbent body 4 side (the skin side of the top sheet 3), but in the width direction It is also possible to form three-dimensional gathers that stand up on the skin side by folding the fabric and arranging an elastic elastic member along the length of the folded portion. Furthermore, although the sanitary napkin 1 shown in the figure is not provided with wing-shaped flaps that protrude laterally on both sides, it has wings that are folded back so as to wrap around the outside of the crotch portion of the shorts when worn on shorts. A shaped flap may be provided to protrude laterally of the side flap portion.

[Convex part, opening part, compressed part]
In the present sanitary napkin 1, as shown in FIGS. 2 to 4, the top sheet 3 has a large number of convex portions 10, 10, . . . that bulge toward the skin side. The convex portion 10 is hollow inside, and a space is formed between the top sheet 3 and the second sheet 6 in the convex portion 10 . The region other than the convex portions 10 is formed substantially flat and is a relatively depressed region compared to the convex portions 10, and the non-skin side of this region is adjacent to the lower layer side of the second sheet 6. is in contact with

The planar shape of the bottom surface of the convex portion 10 may be circular as in the illustrated example, or may be oval, rectangular, polygonal, or the like. Further, although the cross-sectional shape is approximately a semicircular dome shape in the illustrated example, it may also be a trapezoid, a rectangle, or the like.

The size of the planar shape of the convex portion 10 can be determined as appropriate from the viewpoint of improving cushioning properties and reducing the contact area with the skin. It is preferable that the length A is 2.0 to 10.0 mm, and the length B of the sanitary napkin 1 in the width direction is 2.0 to 10.0 mm. Further, the height C of the convex portion 10 is preferably 0.5 to 5.0 mm.

By forming a large number of convex portions 10 on the top sheet 3, the cushioning feeling is increased and the skin feels softer, and the contact area with the skin surface is reduced, so that friction with the skin surface can be reduced. .

Further, in the present sanitary napkin 1, a large number of openings 11, 11, . . . that penetrate the top sheet 3 and the second sheet 6 in the thickness direction are formed in areas other than the convex portions 10. The opening portion 11 is a through hole that integrally penetrates the top sheet 3 and the second sheet 6 in a state where the top sheet 3 and the second sheet 6 are laminated. The aperture 11 is not provided in the area where the convex part 10 is formed, but only in an area that is relatively depressed compared to the convex part 10 where the top sheet 3 and the second sheet 6 are in contact with each other. It is set in.

By providing the aperture 11, body fluids can quickly transfer to the absorbent body 4 through the aperture 11. Furthermore, since the apertures 11 are formed in areas other than the convex portions 10, the convex portions 10 that bulge toward the skin make it difficult for the apertures 11 to come into direct contact with the skin surface. Therefore, even if a fiber end (burr) protruding toward the skin is formed on the periphery of the opening 11 due to piercing or pulling out of the pin during hole drilling, this fiber end will not come into direct contact with the skin surface. , the feeling of wearing becomes better.

As shown in FIG. 2, the separation distance D between the aperture 11 and the convex part 10 (the outer surface of the bottom of the convex part 10) is set so that body fluids flowing down the surface of the convex part 10 can easily flow into the aperture 11. The thickness is preferably 1 to 10 mm, preferably 1 to 5 mm, and more preferably 1 to 3 mm.

In order to ensure liquid permeability in the apertures 11, the area of the apertures 11 on the skin side of the topsheet 3 is preferably 0.01 to 8 mm ² , preferably 1 to 5 mm ² . The cross-sectional shape of the aperture 11 is preferably formed such that the aperture area gradually decreases from the skin side of the top sheet 3 toward the non-skin side of the second sheet 6.

In the embodiment shown in FIGS. 2 to 4, an absorbent body penetrating portion 12 is formed that communicates with the opening portion 11 that penetrates the top sheet 3 and the second sheet 6, and that penetrates the absorbent body 4 in the thickness direction. has been done. The cross-sectional shape of the absorbent body penetrating portion 12 is continuous with the cross-sectional shape of the aperture 11, and the cross-sectional shape of the aperture 11 changes at approximately the same rate in the thickness direction. It is formed in such a shape that the opening area gradually decreases from the side surface to the non-skin side surface.

In order to form the openings 11 and the absorbent body penetrating portions 12, known means can be used without limitation. For example, with the top sheet 3 and the second sheet 6 laminated on the skin side of the absorbent body 4, Examples include a method in which a pin is penetrated from the skin side of the top sheet 3 to the non-skin side of the absorbent body 4 to form holes.

In addition, instead of the absorbent body penetrating portion 12, as shown in FIG. The absorber recess 13 may be formed to be recessed on the side. The absorber recess 13 is a recess that is depressed from the skin side of the absorber 4 to the middle part of the absorber 4 in the thickness direction, and the absorber 4 is interposed at the bottom of the recess.

The cross-sectional shape of the absorber recess 13 is also formed to have a cross-sectional shape continuous with the cross-sectional shape of the opening 11, similar to the cross-sectional shape of the absorber penetrating portion 12, and the cross-sectional shape of the opening 11 changes in the thickness direction. It is formed in a shape in which the cross-sectional area gradually decreases from the skin side to the non-skin side at approximately the same ratio as the skin side.

It is preferable that the absorber recess 13 is machined at the same time as the hole 11 is machined. Specifically, in a state where the top sheet 3 and the second sheet 6 are laminated on the skin side of the absorbent body 4, processing is carried out by piercing a pin from the skin side of the top sheet 3 to the middle part of the absorbent body 4 in the thickness direction. is preferred.

By providing the absorber penetrating portion 12 or the absorber recess 13 in communication with the aperture 11 penetrating the top sheet 3 and the second sheet 6, body fluids passing through the aperture 11 can be absorbed into the absorber penetrating portion 12 or the absorption body. It flows into the body recess 13 and is absorbed into the absorber 4 from the wall surface of the absorber penetrating portion 12 or the bottom and wall surfaces of the absorber recess 13, so that it is quickly absorbed into the absorber 4. In particular, when the absorbent body penetration part 12 is provided, body fluids flow into the non-skin side of the absorbent body 4 and diffuse in the plane direction between the non-skin side of the absorbent body 4 and the back sheet 2. This is preferable because it does not stay in the absorber penetrating portion 12 and quickly diffuses.

In this sanitary napkin 1, a compressed part 14 in which the top sheet 3, second sheet 6, and absorbent core 4 are integrally compressed is provided in a region other than the convex part 10 at a predetermined distance from the opening part 11. It is provided. The top sheet 3 and the second sheet 6 are joined by this compressed portion 14 . The top sheet 3 and the second sheet 6 are preferably joined only by the compressed portion 14 so as not to impede penetration of body fluids, but they can be firmly joined by intermittent application of hot melt adhesive or the like. Good too.

The compressed portion 14 is not provided in the region where the convex portion 10 is formed, but is provided only in a region that is relatively depressed compared to the convex portion 10 where the top sheet 3 and the second sheet 6 are in contact with each other. It is provided.

The compressed portion 14 is preferably formed in a shape in which both the skin side of the top sheet 3 and the non-skin side of the absorbent core 4 are depressed. That is, by squeezing from the skin side of the top sheet 3 and at the same time squeezing from the non-skin side of the absorber 4, as shown in FIG. It is preferable to form the compressed portion 14a from the side, and also form the compressed portion 14b from the non-skin side, which is recessed toward the skin side, on the non-skin side of the absorbent body 4.

By providing the compressed portion 14 at a predetermined distance from the aperture 11, the body fluid absorbed into the absorbent body 4 through the aperture 11 is transferred to the compressed portion 14 by capillary action due to the difference in fiber density. Since the body fluid is drawn into and diffused into the absorber 4, the body fluid does not stay in the aperture 11 and its vicinity, and the absorber 4 does not return from the aperture 11 or inhibit body fluid absorption due to the accumulated body fluid. Absorption performance can be improved.

One or more compressed parts 14 are formed around each aperture 11 at a predetermined distance from the aperture 11 . The separation distance E between the aperture 11 and the compressed part 14 is 1 to 5 mm, preferably 1 to 3 mm. If this separation distance E is smaller than 1 mm, body fluids that have entered the openings 11 and been absorbed into the absorbent body 4 will flow to the outside of the absorbent body penetrating portions 12 or the absorbent body recesses 13 due to capillary action due to the difference in density of the fibers. It is difficult to diffuse and tends to stay in and near the absorber penetrating portion 12 or the absorber recess 13. On the other hand, if it is larger than 5 mm, the effect of body fluid absorbed into the absorbent body 4 from the absorbent body penetration part 12 or the absorbent body recessed part 13 to be diffused toward the compressed part 14 side by capillary action due to the difference in fiber density is significantly reduced; Body fluids tend to stay in the absorbent body penetrating portion 12 or the absorbent body recess 13 and the vicinity thereof.

In the compressed portion 14, the compressed portion 14a formed on the skin side and the compressed portion 14b formed on the non-skin side may have the same or different planar shape. When formed in the same planar shape, the compressed portion 14a from the skin side and the compressed portion 14b from the non-skin side are arranged at positions overlapping in the thickness direction of the sanitary napkin 1.

The planar shape of the compressed portion 14a viewed from the skin side is preferably circular (dot-shaped). Further, the planar shape of the compressed portion 14b from the non-skin side may be circular (dot-shaped) as shown in FIG. As shown in , it may be a lattice-shaped compressed portion that extends continuously to a region other than the convex portion 10 . By forming the skin-side compressed portion 14a and the non-skin-side compressed portion 14b as circular compressed portions, the compressed portions 14 are arranged intermittently, so that the flexibility of the absorbent core 4 can be ensured. . On the other hand, by making the skin side compressed part 14a circular and the non-skin side compressed part 14b shaped like a grid, the absorber 4 is formed with a low compressed part and a high compressed part. This improves the dispersibility of body fluids, allowing more body fluids to be absorbed quickly. When the non-skin side compressed portions 14b are formed in a lattice shape, the absorber penetrating portions 12 or absorber recesses 13 are arranged at the corners of each lattice, and the skin side compressed portions 14a are arranged at each side of each lattice. One or more can be placed.

The bottom of the compressed portion 14 is preferably located within the thickness of the absorbent core 4. That is, in the cross-sectional view shown in FIG. 4, the bottom of the compressed part 14a from the skin side is located within the thickness of the absorbent core 4, and the bottom of the compressed part 14b from the non-skin side is located within the thickness of the absorbent core 4. It is located within the range of As a result, the absorbent body 4 is reliably compressed, and a difference in fiber density is reliably formed.

The ratio of the depth of each compressed part 14a, 14b to the thickness of the absorbent body 4 is such that the compressed part 14a from the skin side is 30 to 60% from the skin side of the absorbent body 4, and the compressed part 14b from the non-skin side is 30% to 60% from the skin side of the absorbent body 4. It is preferable to set it to 40 to 60% from the non-skin side of No. 4.

When forming the absorbent body recess 13 in the absorbent body 4, the bottom of the absorbent body concave 13 is preferably located on the non-skin side from the bottom of the compressed part 14. As a result, the body fluid that has flowed into the absorbent recess 13 through the opening 11 is diffused to the non-skin side part of the compressed part 14, and the return of body fluid to the skin side can be more reliably prevented. Become.

The planar arrangement of the convex portions 10, the apertures 11, and the compressed portions 14 is arbitrary, but as shown in FIG. The aperture 11 is arranged in the center surrounded by the two protrusions 10, 10..., and the compression is performed between the adjacent protrusions 10, 10 around the aperture 11. Preferably, the portion 14 is arranged in the same manner as shown in FIG. As a result, since the aperture 11 is surrounded by the four convex parts 10..., it is possible to reliably prevent the aperture 11 from coming into direct contact with the skin, and the four compressed parts 14... , the body fluid absorbed into the absorbent body 4 through the aperture 11 can easily diffuse to the outside of the aperture 11.

In the embodiment shown in FIG. 2, the compressed portion 14 formed around one aperture 11 and the compressed portion 14 formed around the adjacent aperture 11 are independent from each other. Although it is formed of circular (dot) compressed parts, as shown in FIG. 8, one oval compressed part 14 may be arranged in which adjacent compressed parts 14, 14 are connected.

Next, a method for forming the convex portion 10, the opening portion 11, and the compressed portion 14 will be explained.

A processing device 30 shown in FIG. 9 is used to form the convex portions 10, openings 11, and compressed portions 14. The processing device 30 includes a first embossing roll 31 whose surface is provided with a large number of convex portions corresponding to the convex portions 10, and a first embossing roll 31 that is disposed opposite to the first embossing roll 31, and a first embossing roll 31 on the surface of which the first embossing roll 31 is disposed facing the first embossing roll 31. 31, a large number of concave portions corresponding to the convex portions 31, a large number of needle-like protrusions corresponding to the apertures 11, and a large number of concave portions corresponding to the compressed portions 14 (skin side compressed portions 14a). This device includes a second embossing roll 32 provided with a convex portion, and a third embossing roll 33 provided with a large number of convex portions corresponding to the compressed portion 14 (non-skin side compressed portion 14b), By passing the top sheet 3 between the first embossing roll 31 and the second embossing roll 32, the projections of the first embossing roll 31 and the recesses of the second embossing roll 32 engage with each other. After processing the convex portions 10, the top sheet 3 is run on the surface of the second embossing roll 32, and the processed portions of the convex portions 10 of the top sheet 3 are held in the concave portions of the second embossing roll 32. The second embossing roll 32 and the third embossing roll 33 are then laminated with a laminate of the second sheet 6 and the absorbent body 4 which are separately fed out. By passing between the needle-like protrusions of the second embossing roll 32, the apertures 11 are processed, and the convex parts of the second embossing roll 32 and the convex parts of the third embossing roll process the apertures 11. The compressed portion 14 is processed, and the top sheet 3, second sheet 6, and absorbent body 4 are heat-sealed and joined.

[Other form examples]
In the above embodiment, the convex portions 10 are arranged in a diamond lattice pattern aligned diagonally on the sanitary napkin 1; You can.

DESCRIPTION OF SYMBOLS 1... Sanitary napkin, 2... Back sheet, 3... Top sheet, 4... Absorbent body, 6... Second sheet, 7... Side sheet, 10... Convex part, 11... Opening part, 12... Absorbent body penetration part, 14 …Compressing section

Claims (4)

comprising an absorbent body, a liquid-permeable top sheet covering the skin-contacting side of the absorbent body, and a liquid-permeable second sheet disposed between the absorbent body and the top sheet,
A large number of convex portions bulging toward the skin side are formed on the top sheet in a regular lattice shape or a diamond lattice shape when viewed from above ,
An opening that penetrates the top sheet and the second sheet in the thickness direction is formed in a region other than the convex portion, and an absorbent body penetration that communicates with the opening and penetrates the absorbent body in the thickness direction. or an absorbent body recessed part is formed by recessing the skin side surface of the absorbent body toward the non-skin side,
A compressed part that integrally compresses the top sheet, second sheet, and absorbent body is formed in a region other than the convex part that is a predetermined distance away from the opening part , and is located on the skin side of the top sheet and on the non-skin side of the absorber. It is provided with a recessed shape on both sides,
The planar shape of the compressed portion from the skin side of the top sheet is circular or oval, and the planar shape of the compressed portion from the non-skin side of the absorbent body is a lattice-like shape that extends continuously to an area other than the convex portion. An absorbent article characterized by having a compressed part . The absorbent article according to claim 1, wherein the bottom of the compressed portion is located within the thickness of the absorbent body. The absorbent article according to any one of claims 1 and 2 , wherein the separation distance between the opening part and the compressed part is 1 to 5 mm. In plan view , the aperture is arranged in the center surrounded by the four adjacent protrusions, and the surface sheet is arranged around the aperture and between the adjacent protrusions. The absorbent article according to any one of claims 1 to 3 , wherein the compressing portion is arranged from the skin side .

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